2000 Ford F150 7700 - Rear Differential Casing - Photo 16

The factory Ford rearend was stuffed with 5.13 gears and a limited-slip differential. Trucks built purely for the dirt often use spools to lock both rear axleshafts permanently together. This provides ultimate traction when off-road, but leads to difficult steering and accelerated tire wear on the pavement. Since this truck does dual duty on the street and dirt, a limited-slip was deemed the right tool for the job. Heavy gusseting not only braces the rearend against bending under load on whooped-out roads, but also integrates the rear trailing arm and wishbone mounts. When the truck's tail lifts off, dual Beard limit straps protect the shocks during suspension top-out.